Drawing press or the like



W. KLOCKE AND J. E. DOBSON. DRAWING PRESS OR THE LIKE. APPLICATION FILED MAY 17. 191-9.

1,411,036, Patented Mar.2&,1922.

5 SHEETS-SHEET I.

INVENTORS: WITNESSA a'afl J @ue W By Attorneys,

W. KLOCKE AND J. E. DOBSON.

DRAWING PRESS OR THE LIKE.

' APPLICATION FILED MAY 17. I919. 1,41 1,036. Patented Mar. 28, 1922.

5 SHEETS-SHEET 2.

INVENTORS fl 5% By Attorneys,

WITNESS W. KLOCKE AND J. E. DOBSON.

DRAWING PRESS OR THE LIKE. APPLICATION FILED MAY 11. 1919.

1,41 1,.U36. Patented Mar. 28, 1922..

5 SHEETS-SHEET 3.

INVENTORS By Attorneys,

W. KLOCKE AND J. E. DOBSON.

DRAWING PRESS OR THE LIKE. APPLICATION FILED MAY 1.7, 19m.

1,411,036, Patented Mar. 28, 1922,

' 5 SHEETS-SHEET 4- F/ I, INVE TOR WILLIAM KLOCKE AND JOHN E. DODSON, OF NEW YORK, N. 52., ASSIGNORS TO E. W. BLISS'COMPANY, 0F BROOKLYN, NEW YORK, A CORPORATION OF WEST VIRGINIA.

DRAWING PRESS OR THE LIKE.

maltose.

Application filed. may 17,

To all whom it may concern e it known that we, WILLIAM KLooKn and JOHN E. DoBsoN, citizens of the United States of America, residing, respectively, in the borough of Queens and borough of Manhattan, city and State of New York, have invented certain new and useful Improvements in Drawing Presses or the like, of which the following is a specification.

This invention relates to improvements in presses, and more particularly to presses of the drawing type, and aims to provide improvements therein.

The present invention provides a drawing press in which a reciprocatory part (a bed or blank-holder slide) may approach and recede from the extremes of its movement with a gently retarded and accelerated motion, abrupt and sudden applications of force being avoided, and at the same time dwells of relatively considerable duration given to the reciprocatory driven part at the extremes of its movement' The invention further provides such a press wherein the dwell at one extreme by the reciprocatory driven part may be of greater duration than that at the other end.

In fact, the invention provides a press employing. toggles and links wherein the positive and negative acceleration of the reciprocatory part is relatively uniform at the extremes of the'movement of said part, and

whereby a dwell of from 120 to 140 of a crank movement may be imparted to said reciprocating part.

The invention further provides a press wherein, by a short angular movement'of a part connected to a rotative part by a toggle, an angular movement of 180 may be imparted to said rotative part. I

Other features of the invention will be hereinafter described and embodiments thereof are illustrated in the accompanying drawings and fully described in the following description.

In said drawings,

Figures 1 and 2 illustrate a drawing press embodying the present invention, and employing a reciprocatory blank holder slide, Fig. 1 being a view in side elevation, and

Specification of Letters Patent. Pamgnfg gd Map. 2& 11922 1919. Serial No. 297,911.

Fig. 2 being a front elevation partly in section.

Figs. 3, 4 and 5 are views illustrating a drawing press having a stationary blank holder and movable bed, and also embodying the invention, Fig. 3 being a front elevation partly in section, Fig. 4 being a side elevation partly in section, and Fig. 5 bein a horizontal sectional view on the line V Fig. 4i

Figs. 6, 7, 8 and grams,

Referring to Figs. 1 and 2, numeral 1 designates one of the working parts of the press necessary for drawing, requiring a dwell in its movement, and adapted to carry a tool as for example a blank holder or die,

9 are explanatory diaaccording to the design of the press, 2 a bed,-'.

and 3 a punch or plunger working through the blank holder or die-carrying slide. The plunger 3 is conveniently given a reciprocatory movement by a crank 4 upon a shaft 5, driven from a pulley 6 through a shaft 7, gears 8 and 9, shaft 10, pinion 11 and gear 12.

In the operation of a drawing press, it is desirable to have the blank holder press the blank to be drawn, against the bed (or die carried thereby) prior to the punch or plunger striking the blank, andto dwell during the action of the punch upon the blank and until the punch has completed at least a part of its withdrawal from the shaped blank. It is also desirable, especially with large presses where heavy masses are in reciprocatory motion, that the reciprocatory tool carrying part, as for example, the blank holder or die-carrying slide, be actuated in such a manner as to relatively uniformly accelerate its movement in a positive and negative sense, as it leaves and approaches the extremes of its reciprocation. It is also de-.

sirable to produce such a movement of the reciprocatory part, as for example, the blank holder slide, by means otherthanbams, as

for example, by toggles. In fact, in drawing presses, the reciprocatory blank holders or die-carrying slides (or beds) ,are now usually actuated by a togglev mechanism, the dwell against the blank being efi'ected by an arments of the rangement of such toggles. By the toggle motion of the present invention, however, there is produced a uniform easing of the reciprocatory motion of the blank holder or die-carrying slide or bed) at both extremes of its reciprocation, and also a longer and more decided dwell of the reciprocatory blank holder or die-carrying slide (or bed) may be eflected in the blank-holding position of said part than with previous toggle drawing presses.

The toggle motion of the presentinvention comprises a pair of toggles 15and 16, serially connected, or connected so as to act serially. The leg 17 of the toggle 16 is conveniently directly connected to the reciprocatory part to be actuated, as for example, the blank holder slide, and the other leg 18 of they toggle 16 may be in the form of a crank upon a shaft 19. One leg of thetoggle 15 may be in the shape of a crank arm 20, the other leg being a link 21 which is conveniently connected to a guide, as for example, a link 25, pivoted at one side of the press, as indicated at 26.

The actuating force is applied as to act through the series of toggles and is most conveniently applied to the end of the leg 21 of the toggle 15, as indicated at 27. The means for actuating the toggles is preferably a rotary-to-reciprocatory-movement-convert ing means, and is most conveniently an eccentric pin or crank connected to or upon the same shaft which actuates the punch or plunger, as for example, a crank pin 30 upon the gear 12 upon the crank shaft 5. A connectmg-rod or link 31 serves to connect the E1n 30 with the leg 21 of the toggle series.

y positioning the pin 30 with relation to the crank, the timing and relative moveunch or plunger and of the blank holder s ide (or bed) may be conveniently and readily effected.

The throw of the crank pin 30, may be equivalent t0,'or preferabl approximates in length, the length of the legs 18, 20 and 21, of the series of toggles, when in extended position. The legs of the toggle at the end of the series at which force is applied are preferably slightly longer than one-half the throw of the crank or equivalent part (in the case where the force is applied at the end 2? of the toggle 16), in order that said toggle at the end of the series at which force is applied will not be completely extended, or closed, When the toggle ,at the end of the series nearest the reciprocatory part or blank holder is completely extended or completely closed, thereby avoiding the effects of the actuating force being applied in a dead center direction. a

The arrangement of the toggles is also Such that the partapplying force to the series, as for example, the link '31, acts in a direction which is substantially circumferdwell of the part actuated'by the toggle mechanism by reason of the movement of the force-applying part being taken up almost completely by a simple movement of the extreme leg, a for example, the leg 21 around the axis 33 of its knee. The guide, in the form'of a link, as indicated at 25, preferably turn on a long radius, and has a short angular movement as regards the angular movement of the,r0ck shaft 19130 which the toggles are connected. By referring to Figs. 8 and 9 it will be seen that even'more decided effects, as regards the dwell at the end of the reciprocation, ma be provided by guiding the end of the leg 21 in an are described around the r 3 axis 33 of its knee, at the'end part of the opening movement of the toggle 15 of which said leg 21 is a part. The end of the leg 21 may, during the other part of its movement, be guided in a straight line. The long are described around the axis on which the guide link 25 turns is really a merger into a single curve of the short curve described by the end of the leg 21 at the final part of its opening movement, and a straight line.

By lengthening the radius of the are upon which the end of the leg 21 turns at the end part of the opening movement of the toggle 15, the dwell at the corresponding end part of the reciprocatory part actuated by said toggle mechanism may be prolonged, as may be seen from a comparison of Figs. 8 and 9.

Operation: The operation of the toggle movement, and of the drawing press above described employing said movement, will be best comprehended by reference to the diagrams shown in Figs. 6, 7, 8 and 9. Fig. 6 shows the parts at one extreme of the movementof the reciprocatory part 1 (as for example, the blank holder slide), preferably the working position of the reciprocatory part, and Fig. 7 shows the parts in the position which they occupy at the other end of the reciprocatory motion of said reciprocating part. Assuming the actuating force applied to the toggle series to be derived from a crankpin 30 moving around a driven shaft 5, the extent of movement of said crank pin 30, at eqlual time intervals, will be indicated by the a iquot degree markings at the left-hand side of Fig. 6, and assuming the pin 30 to be revolving in the direction of the arrow, it will act upon the series of toggles through the link 31 to cause said toggles, considered as a whole, to lengthen; the first movement, however, of the toggles being a movement of the leg 21 in an are or approximately in an are described around the axis 33 of the knee of the toggle 15. The axis 34: of the knee of the toggle 16, and the axis 19 around which said toggles turn, and the reciprocatory part 1 being substantially in line (in which position the part 1 can exert or sustain .a maximum force), the movement of the leg 21 around the axis 33, and corresponding to a movement of 60 of said pin 30 (120 movement of the pin 30 for two oscillations of the end of the leg 21 from 27. to 27 and back to 27 Fig. 6) will cause no appreciable movement of the points 19, 34 and 1 out of line. The rectilineal advance of the crank pin 30 will accelerate positivelyto the 180 position, accelerating the movement of the point 27 and the opening of the toggles, but the first part of the movement of the reciprocatory part 1 will be relatively slight as compared with the movement of the point 30 from an angular position of 150 to 180. During the movement of the point 30 from 150 to 180, the toggle'15'will be closing and the point 33 will have about the same angular speed as the point 27, (and by flattening the arc of movement of the point 27, the angular travel of the point 33 may be decreased and vice versa'). The toggle 16, however, will be just opening, and its point 34 at the knee will travel a 'maximum angular distance for a given lineal movement of the driven part 1.

' Therefore, at this part of the movement of the point 30 (i. e. from 150 to 180) there will be a relatively slow acceleration of the point or part 1. From 180 to about 225 of the point 30, said point .30 will be moving generally in the direction of reciprocation of the point 27, and the points 27 and 33 will still -be moving at approximately equal speeds so that the speed of movement is not materially altered by the toggle 15. However, the toggle 16 will be opening with the knee 34 travelling generally in the same direction as the travel of the part 1, and hence the speed of the part 1 will be at its maximum between 150 and 225 of the movement of the point 30. From approximately 225 to 27 0 there is a negative acceleration of the part of point 1 owing to the point 30 moving generally across the direction of transmission of movement to the point 27, and the knee 34: of the toggle 16 moving generally across the direction of movement of the point or part 1 the speed of the parts 30 and 34 being zero at the 270 position. From 270 to 90 the movement of the parts is the inverse of the movement from 90 to 270.

From the foregoing it will be perceived that there is obtained at the working end of the reciprocation of the part-1 a practically complete dwell through an angular movement of 120,to 140 of a crank pin revolving uniformly around its axis, and that the reciprocations of the part 1 are initiated and terminated at accelerations positive and negative to and from zero motion. There is thereby obtained an easy working of the parts, and an avoidance of sudden or violent change in the movements at the extremes of the reciprocation of the'reciprocatory part to be actuated. There is also obtained a pronounced and definite dwell of the reciprocatory part at one end of its reciprocation.

oreover it will be seen that for a relatively small angular movement of the point of application of force to the toggle 15, as the point 27 (see the angle a Figs. 6 and 7) an angular movement of'180 may be imparted to a driven part, as for example, the rock shaft 19.

In Figs. 3 and 4, numeral 1, designates the reciprocatory part, in thiscase being the bed of the press, and numeral 2 designates a stationary blank holder. 3 designates the punch or plunger actuated by a crank 4 upon shaft 5, driven as in theembodiment of Figs. 1 and '2. The actuating force may, as in the preceding embodiment, be derived from a crank pin 30' moving the toggle mechanism through a link 31 connected to the end leg 21 of the series of toggles, as indicated at 27 The bed 1 is actuated the same as the blank holder slide in the embodiment of Figs. 1 and 2, by-the serially acting toggles 15,and 16, comprising the legs 17, 18, 20 and 21. llnstead of the end of the leg 21 at the end .of the series of toggles at which force is applied being guided by a link, the said end of the lever 21 may be guided by a pin and roller 50travelling in a guide slot 51. This guide slot may conveniently be out upon an are similarly to that through which the end of the link 25 moves. Or, this guide slot may bemade up of a curyed part and a straight, or approximately' straight part, as indicated in Figs. 8 and 9. g

The operation of the embodiment shown in Figs. 3, 4 and 5is the same in principle as explained in regard to the embodiment shown in. Figs. 1 and 2. The difference is that the toggle crank 18 is relatively inverted, to give an opposite movement to the part 1'.

The invention involves a mechanical movement which may be combined variously with other elements-than the parts of a drawing press and said mechanical movement is broadly claimed in our application Serial No. 520,308, filed December 6,1921;

It is also obvious that variations may be made in the forms of embodiment. specifically illustrated and described without departing from the idea of the invention. 7

What is claimed is I 1. A drawing press or the like, comprising a rocking part, a toggle connected thereto,and means for swinging said toggle, comprisinga part having a short angular Gil Ill

movement, describing an are generally parallel .to the are described by the swinging end of said toggle connected to said toggle and co-operating to impart a greater angular movement to said rocking part, and a reciprocatory tool carrying part actuated by said rocking-part.

2. A drawingpress or the like, comprising a rocking part, a toggle connected thereto. and means for swinging saidtoggle, comprising a part having a short angular movement, connected to said toggle adapted to impart an angular movement of 180 to said rocking part, and a reciprocatory tool carrying part actuated by said rocking part.

3. A drawing press or the like, comprising a reciprocatory-tool carrying part, a rocking part for actuating said part, a toggle rmmected to said rocking part. and means for swinging said toggle, comprising a part ha ring a short angular movement, describing an are generally parallel to the are described by the swinging end of said toggle, connected to said toggle and co-operating to impart a greater angular movement to said rock-shaft.

4. A drawing press or the like, comprising a reciprocatory tool carrying part, a pair of toggles, one of which is a swinging toggle. serially connected for actuating said reciprocatory part, and means applying force to said swinging toggle, said toggles being s arranged that the pivots of each of said pairs of toggles approximate alinement during the time said reciprocatory part is at one extreme of its movement.

5. A drawing press or the like, comprising a reciprocatory tool carrying part. a pair of toggles, one of which is a swinging toggle, serially connected for actuating said reciprocatory part. and means applying force to said swinging toggle, said toggles being so arranged that the pivots of each of said pairs of toggles respectively approximate'alinement duringthe time said reciprocatory part is at the extremes of its movements, one of said toggles being longer than the other. 6. A. drawing press or the'like, comprising a reciprocatory tool carrying part, a pair of toggles, one of which is a swinging toggle, serially connected for actuating said reciprocatory part. and means applying force to said swinging toggle. said toggles being so arranged that the pivots of each of said pairs of togglesapproximate alinement during the time said reciprocatory part is at the extremes of its movements. one of said toggles having an opening movement while the other remains with its axes substantially in line.

7. A drawing press or the like. comprising a reciprocatory tool carrying part. a pair of toggles serially connected for actuating said reciprocatory part, and means applying force to said reciprocatory part throu hsaid to gles, said toggles bein connected on a fi ed axis, and the Ima es of said toggles being movable approximately 180 around said fixed axis, the angular movement around the fixed axis by one knee partially overlapping the are included in the angular movement of the other knee.

9. A drawing press or the like, comprising a reciprocatory tool carrying part, a pair of toggles serially connected for actuating said reciprocatory part, and means applying force to said reciprocatory part through said toggles. said toggles being connected on a fixed axis and the knees of said toggles being movable approximately 180 around said fixed axis, and means guiding the extreme leg of the series.

10. A drawing pressor the like, comprising a reciprocatory tool carrying part, a pair of toggles serially connected for actuating said reciprocatory part, and means applying force to said reciprocatory part through said toggles, said toggles being connected on a fixed axis and the knees of said toggles being movable approximately 180 around said fixed axis, and means guiding the extreme leg of the series in a fiat are.

11. A drawing press or the like, comprising a reciprocatory tool carrying part, a pair of toggles serially connected for actuating said reciprocatory part, and means applying force to said reciprocatory part through said toggles, said to gles being connected on a fixed axis'and the knees of said toggles being movable approximately 180 around said fixed axis, and means guiding the extreme leg of the series in a flat are having its center substantially in a straight line drawn perpen'dicularto the direction of reciprocation at the fixed axis of said toggles.

12. A movement for drawing presses or r the like, comprising a reciprocatory tool carrying part, a pair of toggles serially connected for actuating said reciprocatory part, and means applying force to said reciprocatory part through said toggles, said toggles being connected on a fixed axis and the knees of said toggles being movable approximatel 180 around said fixed axis, and means gui ing the extreme leg of the series, said guide having a curvature at one part which substantially coincides with an are drawn around the axis of a knee on one of said toggles at approximately an extreme of its movement.

1,411,,ose

13. movement for drawing presses or the like, comprising a reciprocatory tool carrying part, a pair of toggles serially connected for actuating said reciprocatory part,

and means applying force to said reciprocatory part through said toggles, said toggles being connected on a fixed axis, and

' the knees of said toggles being movable approximately 180 around said fixed axis, and means for causing the end of the extreme leg of the toggle at the force-receiving end of the series to move in an arc substantially parallel to its other leg at an extreme of the movement of said series of toggles.

14. A drawing press, or the like, comprising a -rocking part, a toggle connected thereto, a part having a short angular movement, connected to said toggle, adapted to impart a greater angular movement to said rocking part, and a reciprocatory tool carrying part actuated by said rocking-part, said rocking part and the part having the short angular movement being so arranged that the angular movements thereof are substantially symmetrical with relation to two planes passing through the axis of said rocking part.

15. A drawing press, or the like, comprising a rocking part, a toggle connected thereto, a part having a short angular movement, connected to said toggle, adaptedto im art a greater angular movement to said roe ing part, and a reciprocatory tool carrying part actuated by said rocking part, said rocking part and the part having the short angular movement bein so arranged that the angular movements t ereof are substantially symmetrical with relation to a plane passing through the axis of said rockin part.

16. A drawing press or the like, comprising a rocking-part, a toggle connected thereto, and means for swing ng said toggle connected to said toggle, the joint between said toggle and swinging means having a line of movement substantially parallel to the are a of movement of said joint around the knee of said toggle at one extreme of movement, and a reciprocatory tool carrying part actuated by said rocking-part.

17 A drawing press or the like, comprising a rocking part, a toggle connected there- ,to, means for swinging said toggle, comprising a connection between said toggle and swinging means, said connection having a short angular movement, and said means acting to impart a greater angular movement to said rocking part, and a reciprocatory tool carrying driven part actuated by said rocking part.

18. A drawing press or the like comprising a punch drlvlng shaft, a reciprocatory tool carrying slide, and means for reciprocating the same, said means comprising a rocking part, a toggle connected thereto, means for swinging said toggle, comprising a part having a short angular movement describing an are generally parallel to the are described by the swinging end of said toggle, connected to said toggle and cooperating to impart a greater angular movement to said rocking part, and a link connectin said punch driving shaft and said part the short angular movement.

19. A drawing press or the like comprising a side frame, a punch driving shaft extending through said side frame to the other aving side thereof, a wheel on said shaft on the outer side of said frame, a reciprocatory tool carrying slide and means for reciprocating the same, said means comprising a rocking part, a toggle connected thereto, means for swinging said toggle, comprising a part having a short angular movement describlng an are generally parallel to the arc described by the swinging end of said toggle, connected to said toggle and cooperating to impart a greater angular movement to said rocking part, and a link having a driving connection with said shaft at the outer side of said wheel and to said part having the short an lar movement.

p 20. A rawing press or the like comprising a punch driving shaft, a reciprocatory tool carrying slide, a pair of toggles, one of which is aswinging toggle, serially connected for actuating said reciprocatory slide, said toggle being connected on a. fixed axis and being so arranged that the pivots of each of said pairs of toggles approximate alinement during the time said reciprocatory slide is at an extreme of its movement, one of said toggles having ano ening movement while the other remains with its axes substantially in line, a part having a short angular movement guiding the swinging end of said swinging toggle, and a driving connection between said punch driving shaft and part with the short angular movement.

In witness whereof, we have hereunto signed our names.

LIAM KLOCKE. JOHN E. DOBSON. 

